fLoadBuffer (Function)

ONLINE HELP
WINDEV, WEBDEV AND WINDEV MOBILE

Version:

Home | Sign in | English

This content has been translated automatically. Click here to view the French version.

Help / WLanguage / WLanguage functions / Standard functions / External file functions

Operating mode in Windows Vista (and later)

WINDEV

WEBDEV

WINDEV Mobile

Others

See also

fLoadBuffer (Function)

In french: fChargeBuffer

Loads the content of an external file (text, image, ...) in a buffer variable.

Example

MyBuffer is Buffer 
MyBuffer = fLoadBuffer("c:\tmp\MyFile.raw")

// Read the first 50 bytes of the file from the beginning
MyBuffer is Buffer 
MyBuffer = fLoadBuffer("C:\Dir\Fic.test", 0, 50)

Syntax

<Result> = fLoadBuffer(<External file> [, <Position> [, <Size>]])

<Result>: Buffer

Content of text file.

<External file>: Character string

Name and full (or relative) path of external file (text, image, ...). A UNC path can be used. This file doesn't have to be in TXT format: binary 0s are allowed.
The file path corresponds to a full path or to a path relative to the current directory (returned by fCurrentDir). This parameter is case-sensitive.
Reminder: On iPhone/iPad, both on the device and in the emulator, the file system is read-only.. An application can only write to its installation directory or one of its subdirectories.

<Position>: Optional integer

Position from which the text file must be loaded. This position is expressed in bytes (or in number of characters).
This parameters corresponds to 0 (beginning of file) by default.
This parameter is not available.

<Size>: Optional integer

Maximum size of the file to load. This size is expressed in bytes (or in number of characters).
By default, this size corresponds to the total size of the file.
This parameter is not available.

Remarks

Operating mode in Windows Vista (and later)

If this function does not work properly in Windows Vista (and later), check whether the file or directory used is not in one of the system directories (Windows directory or "Program Files" directory).

In Windows Vista (and later), with the UAC mechanism (User Account Control) enabled, you must have administrator privileges to handle and/or modify the files or directories in system directories (Windows directory or "Program Files" directory).

Programming tip: If you need to manipulate / modify files or directories, without needing administrator privileges, it is advisable:

avoid writing to the Windows directory or to the "Program Files" directory,
use the system directory of the application (returned by SysDir with the srAppDataCommun constant, for example).

Component: wd300std.dll

See also

Minimum version required

Version 16

This page is also available for…

Comments

Exemplo

floadbuffer(fcurrentdir()+fsep()+”meu.pdf”)

PdfFileTxt is string = encode(bufferPdf, encodeBASE64)

Tem que transformar o arquivo em buffer e de buffer em text base64

Inverso

MypdfBuffer is buffer = Decode(textoCode64, encodebase64)

Vc vai ter que materializar o buffer em arquivo

FsaveBuffer(fcurrentdir()+fsep()+”meu.pdf”, mypdfBuffer)

Gerando assim o pdf em disco, pois:

PDF, PNG, svg, jpg, docx, xlsx, bmp são buffers

Boller

30 Nov. 2023

Seleciona Imagem e Resize

PROCEDURE SelecionaImagem(Janela, ControleImagem,bResize is boolean)

bufImagebuffer is Buffer

sFile is string = fSelect("c:\", "Selecione uma Foto...", "Todos os arquivos (*.*)" + TAB + "*.*" + CR + "PNG" + TAB + "*.PNG" + CR + "JPEG" + TAB + "*.JPEG" + CR + "JPG" + TAB + "*.JPG", "*.*")

IF fFileExist(sFile) = True

bufImagebuffer = fLoadBuffer(sFile)

sControlTelaImg is string = Janela +"."+ ControleImagem //monta a string do indirection

{sControlTelaImg,indControl} = bufImagebuffer

IF bResize = True

dResize({sControlTelaImg,indControl},{sControlTelaImg,indControl}..Width,{sControlTelaImg,indControl}..Height,drHomotheticCentered)

END

ELSE

Info("Nenhum arquivo selecionado!")

END

RESULT bufImagebuffer
//CASE ERROR:
//
CASE EXCEPTION:

BOLLER

23 Mar. 2019

Como usar a procedure SelecionaImagem

IMG_LogoCompany = SelecionaImagem("WIN_GPU_02_Menu","IMG_LogoCompany",True)

BOLLER

23 Mar. 2019

Last update: 09/30/2024

Send a report | Local help